I thought about something like that too but than there are dialogues which are already hard to understand because they're not loud enough just before you get blasted with sound effects again...well yeah..one more reason why I don't go to the movies so much anymore.

The types of ear plugs for music are high-fidelity and barely distort the sounds you actually want to hear, like dialogue.

Can you recommend a product?

Not in particular. At the time I was residing in the UK and just swung by a music store on the way to a show and asked the guy what he recommended and it's been on my keychain for several years.